Free calculator
Conversion Rate Calculator for Google Ads and Stores
Enter conversions and the clicks or sessions that produced them. You get the conversion rate, the clicks each conversion takes and the conversions per thousand clicks. A second form takes a conversion goal and a rate and returns the clicks you need to buy. Nothing you type leaves your browser.
Calculator
Calculate Your Conversion Rate
The form holds a worked example: 85 conversions from 2,400 clicks. Replace it with your numbers; enter sessions instead of clicks for an analytics-style rate.
Want us to check the account behind this number?
The math
The Conversion Rate Formula and Its Two Denominators
The conversion rate formula is conversions divided by the interactions that could have led to them, shown as a percentage. Google Ads Help defines it as the average number of conversions per ad interaction and gives 50 conversions from 1,000 interactions as 5%. 85 conversions from 2,400 clicks is 3.54%.
Google Ads divides by ad interactions, which for Search and Shopping means clicks. Analytics tools divide by sessions: Google Analytics 4 names its version the session key event rate. The two denominators count different things. One click can open two sessions when the person comes back later, a click can end before the page loads its tag, and a session can start from a saved link with no click at all. The same store reads one rate in Google Ads and another in analytics, and both are right about what they count.
Keep the two apart. The Google Ads rate judges the ads and plans the budget; the analytics rate judges the site. A store's ecommerce conversion rate across all traffic says little about one campaign, because the campaign's visitors are a different mix of people from the whole.
Conversion rate decides the budget more than CPC does. The clicks you need are conversions divided by the rate, so 120 conversions at 3.54% take 3,390 clicks, and one point of rate either way moves that by hundreds of clicks. The Google Ads budget calculator turns the clicks into a monthly and daily budget.
conversions ÷ clicks × 10085 ÷ 2,400 × 100 = 3.54%clicks ÷ conversions2,400 ÷ 85 = 28.2conversions wanted ÷ conversion rate120 ÷ 3.54% = 3,390 (rounded up)key events ÷ sessions × 100Same math over a different denominatorclicks needed × CPC3,390 × $3.00 = $10,170.00Clicks needed
Clicks Needed for a Conversion Goal
Enter the conversions you want and the rate you expect. The worked example is 120 conversions at 3.54%. Clicks are rounded up to a whole click.
By rate
Clicks Needed for 100 Conversions by Rate
Same goal of 100 conversions and a $3.00 CPC. Only the conversion rate moves; cost per conversion is CPC ÷ rate.
| Conversion rate | Clicks needed | Budget at $3.00 CPC | Cost per conversion |
|---|---|---|---|
| 1% | 10,000 | $30,000.00 | $300.00 |
| 2% | 5,000 | $15,000.00 | $150.00 |
| 3% | 3,334 | $10,002.00 | $100.00 |
| 5% | 2,000 | $6,000.00 | $60.00 |
| 8% | 1,250 | $3,750.00 | $37.50 |
Why the rate decides the budget. Moving from 2% to 5% cuts the clicks from 5,000 to 2,000 and the budget from $15,000 to $6,000 with it. The CPC is set by the auction and you can only nudge it; the landing page, the offer and the match types are yours, and each point of rate they gain is worth more than a dime off the click. For a store, the ROAS calculator turns margin into the target cost per conversion the rate has to meet.
Counting
How Google Ads Counts a Conversion
Three things that change the Conversions column before you divide, and so change the rate.
Primary and secondary actions
Google Ads Help sets each conversion action inside a goal as primary or secondary. A primary action is used for bidding and reporting when the campaign optimizes toward its goal; a secondary action is excluded from the Conversions column and reported in All conversions. Only primary actions the campaign optimizes toward appear in the Conversions and Conversion value columns. The rate you divide from is therefore a choice: a page view set as primary inflates it, a purchase left as secondary hides it.
What moves the rate
Three things. The landing page: speed on a phone, a headline that repeats the ad, one form or one phone number above the fold. The offer: price, shipping, proof and the guarantee. The traffic mix: match types and audiences decide who clicks. A rate that falls with no change on the page points at the queries; one that falls on every campaign at once points at the page or the tag.
Tracking that inflates or hides it
A tag that fires twice, counts Every instead of One, or sits on a thank-you page people can reload reports more conversions than there are. A tag blocked by consent settings, missing from the checkout, or firing before the page loads reports fewer. Our conversion tracking guide covers the setup and the checks, and our conversion tracking service rebuilds it when the numbers cannot be trusted.
Common mistakes
Where Conversion Rate Math Goes Wrong
Six habits that make a rate look better or worse than the account.
- Periods that have not filled in yet. The Conversions column credits a conversion to the day of the click, so the last days of any range keep gaining conversions for weeks. Compare periods that have had time to fill.
- Every conversion action in one rate. Calls, page views and purchases divided by the same clicks give a rate that describes nothing. Segment by conversion action and judge one.
- The Google Ads rate compared with the store's rate. One divides by clicks, the other by sessions over all traffic. Compare each with its own history.
- Small numbers read as trends. One extra conversion from 2,400 clicks moves the rate from 3.54% to 3.58%; on 240 clicks it moves it by 0.42 points. Judge the rate on hundreds of conversions, or on a 90-day window.
- Budget cut when the rate is the problem. At 1% the example needs 12,000 clicks for 120 conversions; a smaller budget buys fewer of the same expensive conversions. Fix the page and the queries, then set the budget.
- No target rate before the campaign starts. Without one every result looks fine. Take the rate from the landing page's history in another channel, run the table at 1%, 2% and 3%, and fund the lowest.
How do I calculate conversion rate?
Divide conversions by the clicks or sessions that produced them and multiply by 100. 85 conversions from 2,400 clicks is 85 ÷ 2,400 × 100 = 3.54%. Google Ads Help defines the metric as the average number of conversions per ad interaction, shown as a percentage, with 50 conversions from 1,000 interactions as 5%.
What is a good conversion rate?
One that leaves a cost per conversion below what a sale or lead is worth: CPC ÷ conversion rate. At a $3.00 CPC a 3% rate costs $100.00 per conversion and a 1% rate costs $300.00. A published average blends industries, offers and traffic sources, so compare your rate with your own history and your target. This page gives no benchmark.
What is the difference between the Google Ads conversion rate and an ecommerce conversion rate?
Google Ads divides conversions by ad interactions, which for Search and Shopping means clicks. A store's ecommerce conversion rate divides orders by sessions over all traffic, and Google Analytics 4 names its version the session key event rate. Clicks and sessions do not match one to one, and the store's traffic is a different mix of people, so the two rates differ and both are correct about what they count.
How many clicks do I need for 120 conversions?
Divide the conversions by the rate and round up. 120 ÷ 3.54% is 3,390 clicks; at 4.54% it is 2,644 and at 2.54% it is 4,725. Multiply by your CPC for the budget, or open the Google Ads budget calculator with the same numbers.
Which conversions does Google Ads count in the rate?
Primary conversion actions inside the goals the campaign optimizes toward. Google Ads Help states that a secondary action is excluded from the Conversions column and reported in All conversions, so the rate changes when you move an action between the two settings, and it can pass 100% when more than one action is counted per interaction.
Does the calculator store my numbers?
No. The math runs in your browser, and nothing you type is sent to us or saved anywhere.
Can you check whether our tracking counts correctly?
Yes. A free Google Ads audit looks at the account and the tags behind the numbers. We tell you whether we found what is inflating or hiding conversions and name one or two issues; the full list and the fixes are part of management.
Free audit
Want Us to Check the Account Behind This Rate?
Send us the account and the rate you entered. We tell you whether we found what is holding the conversion rate down, or miscounting it, and name one or two issues before any work starts.
- Google Partner agency
- Shopify Partner
- No obligation
Sources
Sources and Related Pages
- Google Ads Help, Conversion rate: Definition: support.google.com/google-ads/answer/2684489. The average number of conversions per ad interaction, shown as a percentage: conversions ÷ the interactions that can be tracked to a conversion in the same period (50 ÷ 1,000 = 5%); the rate can pass 100% when more than one conversion action is counted per interaction. Read October 25, 2026.
- Google Ads Help, About conversion goals: support.google.com/google-ads/answer/10995103. A primary action is used for bidding and reporting when the campaign optimizes toward the goal; a secondary action is excluded from the Conversions column and reported in All conversions; only primary actions the campaign optimizes toward appear in the Conversions and Conversion value columns. Read October 25, 2026.
- Google Analytics Help, About key events: support.google.com/analytics/answer/9267568. Names the Key events column and the Session key event rate metric, and describes creating Google Ads conversions from Analytics key events. Read October 25, 2026.
- Logical Gecko, Google Ads Conversion Tracking: 2026 Setup and Testing Guide.